An element has a half-life of 30 years. if 1.0 mg of this element decays over a period of 90 years, how many mg of this element would remain?

How does body heat affect the temperature of the train station?

Grams of sodium chloride in 30mL of a 1.2M solution

Magnesium has 2 valence electrons, and oxygen has 6 valence electrons. Which type of bonding is likely to occur between a magnesium atom and an oxygen atom? A) Ionic-Magnesium will give 2 electrons to oxygen, and both will become ions.

The laws surrounding the motion of planets in our solar system can be replaced by new laws describe what happens in nature under certain conditions prove that theories on space are non-testable can be used to prove that theories on gravity are

Which factors affect the strength of the interaction between two objects with electrical charges? Choose all answers that are correct. A. the distance between the objects B. the force the objects exert C. how much charge the objects have D.

Ice melting, water boiling, lighting a match, grape juice freezing. Which statement describes evidence of a chemical reaction

How do the relative concentrations of hydronium ions and hydroxide ions compare in acidic solution?

Give the name of the orange metal visable after one week

What is the rough er connected to

Two students design an experiment to see if pushing or pulling a box across the floor is more effective. The first student pushes the box across the floor a distance of 20 feet and the second student times how long it takes.